8 votes
Accepted

Will reused yeast change beer taste?

we can get away with re-using yeast, because Mutation isn't instantaneous, it take multiple generations to change a whole batches properties. Also bigger brewers use a "mother culture" to grow more ...
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  • 1,759
7 votes

Can I dry my own yeast to make it relatively shelf stable? How?

How did Monks and farmers do it? Farmers in Norway apparently do it with even less fanfare. http://www.garshol.priv.no/blog/342.html Terje took some wort in a plastic bucket. Then he brought out ...
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  • 101
7 votes

How long does it take for yeast to mutate into having other characteristics?

Yeast follow the laws of natural selection. As a cell is budding the new mass may have some minor defects / mutations. If those changes give the yeast an advantage to survive it will get passed on. ...
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6 votes

Culture yeast from bottles

Sure, there's no reason you can't do this. Realistically, though, since you're talking about a beer you've brewed yourself, there are other times in the process where it is much easier to collect ...
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5 votes

Should yeast be washed or just stored in the beer?

Yes, the current consensus is don't bother rinsing (homebrewers almost never truly wash) the yeast. I have verified this for myself over the course of hundreds of batches. There is no advantage to ...
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  • 33.3k
5 votes
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Can I wash yeast with tap water or starsan?

Washing yeast with Starsan will kill most of the yeast. Just like it kills off other microbes in your equipment when you sanitize. All stored yeast should really be used within a few weeks. I ...
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  • 36.2k
4 votes
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Questions on keeping a yeast strain going over and over

'So what exactly is 4 - 6 generations? [...] Are all of those considered generation 2?' A generation of yeast is considered as having gone from pitching to post-fermentation collection. So if you ...
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4 votes

What's the best method of storing yeast for 4 to 6 months in the refrigerator?

Just do it Nothing you described is needed or beneficial with modern liquid yeast packages. For example Weast's Activator: The Activator™ package was designed with superior UV light- and oxygen-...
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  • 3,708
4 votes

Which is better: old yeast from the primary fermentation or reused yeast from primary fermentation?

The honest answer is: There's no black and white answer to this. Reason being that yeast is a living micro-organism, making it very difficult (especially on the homebrewer's scale/budget) to measure ...
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  • 5,954
4 votes
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Yeast plate not showing single colonies

It looks like you streaked several times from the same sample of yeast, and that there was a bit too much liquid in each streak (they resemble puddles). The liquid should be nearly invisible on your ...
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  • 3,030
3 votes

Can I dry my own yeast to make it relatively shelf stable? How?

This all looks a bit like gobbledygook if you ask me. The intention is not to dry yeast commercially, simply for the home brewer. Norweigien Kveik has been dried at home for centuries, how do you ...
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3 votes
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Is autolysis a problem when reusing yeast?

You'll want to keep the yeast cool (under some beer) or cold (in the fridge after the beer is removed) to minimize autolysis. The warmer it is the faster they run out of glycogen, and once they run ...
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  • 3,030
2 votes

How many times can yeast be reused?

Generally you will have few commercial brewers that will reuse it more than 5 or 6 times with out re-culturing; and re-scaling up a starter. Ignoring mutation it could theoretically last for ever, but ...
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  • 6,983
2 votes
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Which is better: old yeast from the primary fermentation or reused yeast from primary fermentation?

In theory you could reuse yeast forever, that's how breweries were supposed work before the first pure yeast strains were isolated by Carlsberg. But...that probably only works in locations favorable ...
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  • 3,030
2 votes

Should yeast be washed or just stored in the beer?

I disagree that yeast slurry shouldn't be 'washed' (purified, really) in general. I think it's all about how you go about it and what you want to accomplish. If it's done right, in a sanitary manner, ...
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2 votes

Yeast washed, combine containers?

If you practice good sanitation. Decant the water off and combine to save space.
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2 votes

Chunky yeast Safeale-05 safe to pitch?

Looks fine, and it is smells fine and the beer off it has no off flavours then you should be good to go. I guess the yeast looks a bit odd because usually you would get a wide shallow yeast cake that ...
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  • 6,983
2 votes

is my cider infected or is this normal for safaleUS05

Yes, but expect the same results. Sounds like a wild yeast that doesn't flocculate and stays in suspension. If it tastes good then use it.
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2 votes

Culture yeast from bottles

I've done it, so it's definitely possible. You just have to bear some caveats in mind. How many batches have been fermented with the yeast? Remember that some strains tend to mutate faster than ...
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  • 273
2 votes

Culture yeast from bottles

Yes, that's perfectly fine, however the best way to conserve a strain of yeast that you already have on hand is by making an oversize starter and saving a portion of it or slanting the yeast. this way ...
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2 votes

Pink (or salmon) colored colonies on foam in starter flask

I suspect that the source of the infection was glycerin I used, since I perhaps erroneously assumed it should be sterile from a previously unopened container. I found citations that Sporobolomyces in ...
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  • 257
2 votes
Accepted

Pitching stressed yeast cake (Wit)

The esters which provide the banana aroma are only formed at the start of the fermentation, when the yeast grows and multiplies. And indeed underpitching is part of this. However, after your first ...
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  • 3,565
2 votes

Reusing yeast yes/no and how much?

The generally specified amount is about 1/3 of a cup of yeast slurry into a 20 litre/5 gallon batch - so maybe 25ml, more?. This is all very rough, because you can never be sure of the concentration ...
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  • 2,050
1 vote
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Total Yeast Cell Count

If you are combining the starters you have: 0.34B/mL @ 6L = 2040 Billion 1.46B/mL @ 1L = 1460 Billion Total Yeast Cells Combined = 3500 Billion @ 7L After combining the starters, cold crashing will ...
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  • 26
1 vote

Can I wash yeast with tap water or starsan?

If tap water is safe to use or not will depend on who you ask and where in the world they live. I'd seek advice about that locally. Around where I live pretty much everyone I know just use straight ...
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  • 318
1 vote

Chunky yeast Safeale-05 safe to pitch?

That's just well flocculated yeast. Just break it up the best you can by agitating. Even if there's still clumps the outer yeast will feed and break away and disperse as they produce cO2.
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1 vote

Chunky yeast Safeale-05 safe to pitch?

As long as there no off-flavours, should be safe to repitch. It's not just yeast in the cake, but also hot&cold break etc.
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  • 1,488
1 vote
Accepted

is my cider infected or is this normal for safaleUS05

Vomit taste is butyric acid, produced by anaerobic bacteria such as Clostridium butyricum, C. kluyveri, and Megasphaera spp 1 during glucose fermentation I would not recommend re-using the yeast. ...
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  • 2,149
1 vote

is my cider infected or is this normal for safaleUS05

IMHO it is not worth trying to reuse a Saf05 yeast that has been fermenting in questionable circumstances. The yeast is too cheap to buy to risk an infection or even a failure. More over it is not ...
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  • 5,626
1 vote

Harvesting yeast

There are no doubt yeast cells throughout it, but if you're going to pitch from that, you should use the topmost white stuff below the liquid. All of the slurry below the liquid should be fine, but ...
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